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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-7340] Clarify statement re: creating unique indexes on sharded collections</title>
                <link>https://jira.mongodb.org/browse/DOCS-7340</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;From &lt;a href=&quot;https://github.com/mongodb/docs/blob/master/source/tutorial/enforce-unique-keys-for-sharded-collections.txt#L22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/blob/master/source/tutorial/enforce-unique-keys-for-sharded-collections.txt#L22&lt;/a&gt; :&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;MongoDB does not support creating new unique indexes in sharded&lt;br/&gt;
collections and will not allow you to shard collections with unique&lt;br/&gt;
indexes on fields other than the ``_id`` field.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;There seems to be one notable exception to the above statement: MongoDB 3.2 supports creating a new unique index on a sharded collection if the shard key is a prefix of the new unique index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="269819">DOCS-7340</key>
            <summary>Clarify statement re: creating unique indexes on sharded collections</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="jonathan.destefano@mongodb.com">Jonathan DeStefano</assignee>
                                    <reporter username="bryan.deeney@yougov.com">Bryan Deeney</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Mar 2016 21:02:04 +0000</created>
                <updated>Sun, 21 Jan 2018 00:26:39 +0000</updated>
                            <resolved>Sun, 21 Jan 2018 00:26:39 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1779986" author="kay.kim@10gen.com" created="Sun, 21 Jan 2018 00:26:39 +0000"  >&lt;p&gt;Hi &amp;#8211; the section has been updated via a separate ticket:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-shard-key/#unique-indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/sharding-shard-key/#unique-indexes&lt;/a&gt;&lt;/p&gt;</comment>
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